I hope you're planning to tell them together together and not make either of you the evil-doer. Your kids love you both and deserve to see you handle this in an adult manner.
Good luck, I know how painful this is.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss